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Plant and Cell Physiology Advance Access originally published online on July 18, 2006
Plant and Cell Physiology 2006 47(8):1182-1186; doi:10.1093/pcp/pcj088
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© The Author 2006. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

Short Communication

Regulation of Nitrate Reductase by Non-Modifiable Derivatives of PII in the Cells of Synechococcus elongatus Strain PCC 7942

Nobuyuki Takatani, Masaki Kobayashi1,, Shin-ichi Maeda and Tatsuo Omata*

Laboratory of Molecular Plant Physiology, Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, 464-8601 Japan

* Corresponding author: E-mail, omata{at}agr.nagoya-u.ac.jp; Fax, +81-52-789-4107.

In Synechococcus elongatus, the PII protein inhibits both transport and reduction of nitrate when ammonium is present in the medium. Using a transporter mutant having ammonium-resistant nitrate transport activity as the genetic background, we analyzed specific effects of PII on in vivo nitrate reductase activity by measuring uptake of nitrate from the medium. The results showed that the regulation of nitrate reductase does not require changes in the electric charge or size of the side chain at the phosphorylation site of PII. Phosphorylation of PII is thus unlikely to play a role in the regulation of nitrate reductase.

1 Present address: Biological Research Laboratories, Nissan Chemical Industries, Saitama, 349-0294, Japan.

(Received May 10, 2006; Accepted July 3, 2006)
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J. Espinosa, K. Forchhammer, and A. Contreras
Role of the Synechococcus PCC 7942 nitrogen regulator protein PipX in NtcA-controlled processes
Microbiology, March 1, 2007; 153(3): 711 - 718.
[Abstract] [Full Text] [PDF]


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